Open path CO2 analyser

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, , Citation E J Brach et al 1981 J. Phys. E: Sci. Instrum. 14 1415 DOI 10.1088/0022-3735/14/12/016

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1 Engng. & Statistical Res. Inst., Agriculture Canada, Ottawa, Ont., Canada

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0022-3735/14/12/1415

Abstract

An open path CO2 analyser is described for measuring CO2 fluxes over crop canopies by the eddy correlation technique. The analyser measures CO2 concentration within 0.3 ppm by volume with a time constant of 0.075 s. The CO2 concentration is determined from a comparison of the absorption of infrared radiation in the 3.7 mu m and 4.3 mu m bands over a 1.5 m path.

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10.1088/0022-3735/14/12/016